Introduce the abstract class WebViewBase, to decouple WebViewImpl.

third_party/WebKit/Source/web/InspectorEmulationAgent.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef InspectorEmulationAgent_h
 #define InspectorEmulationAgent_h
 
 #include "core/inspector/InspectorBaseAgent.h"
 #include "core/inspector/protocol/Emulation.h"
 #include "platform/WebTaskRunner.h"
 
 namespace blink {
 
 class WebLocalFrameImpl;
-class WebViewImpl;
+class WebViewBase;
 
 namespace protocol {
 namespace DOM {
 class RGBA;
 }  // namespace DOM
 }  // namespace protocol
 
 class InspectorEmulationAgent final
     : public InspectorBaseAgent<protocol::Emulation::Metainfo> {
   WTF_MAKE_NONCOPYABLE(InspectorEmulationAgent);
@@ skipping 27 matching lines @@
       protocol::Maybe<protocol::DOM::RGBA>) override;
 
   // InspectorBaseAgent overrides.
   protocol::Response disable() override;
   void Restore() override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   InspectorEmulationAgent(WebLocalFrameImpl*, Client*);
-  WebViewImpl* GetWebViewImpl();
+  WebViewBase* GetWebViewBase();
   void VirtualTimeBudgetExpired();
 
   Member<WebLocalFrameImpl> web_local_frame_impl_;
   Client* client_;
   TaskHandle virtual_time_budget_expired_task_handle_;
 };
 
 }  // namespace blink
 
 #endif  // !defined(InspectorEmulationAgent_h)